Idxbuild stops woth error 11482 - errno 28

I am doing an idxbuild on a 100GB database on Red Hat Linux 7 using OpenEdge 11.5 and it stops with Error writing to temp file sequentially, current directory is , blockOffset is , errno is 28, instance id is . (11482).

The -T filesystem is not full. I cannot find anu reference to this error 28. What should i be looking at?

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